N.Y. Comp. Codes R. & Regs. tit. 20, § 642.3
(a) In addition to the taxes imposed by subdivisions 1 and 2 of section 253 of the Tax Law, subdivision 1-a of section 253 of the Tax Law imposes the special additional tax upon the recording of each mortgage on real property located in this State, at a rate of 25 cents for each $100 and each remaining major fraction thereof of principal debt or obligation which is, or under any contingency may be secured at the date of execution of such mortgage or at any time thereafter.
(1) Any mortgage of real property shall be exempt from the special additional tax if each of the following conditions is met:
(b) Residential-natural person exemption.
(c) Payment of tax.
(ii) In cases where the mortgagee is an organization which is organized other than for profit, which is operated on a non-profit basis and no part of the net earnings of which inures to the benefit of any officer, director or member and which is exempt from Federal income tax pursuant to section 501(a) of the Internal Revenue Code, and the real property covered by the mortgage is principally improved or is to be principally improved as described in this paragraph, the mortgagor must pay the special additional tax.
(2)
(1)
Tax Law, § 253(1-a)